Table 1.

Traditional match weights, match weights incorporating dependence between identifiers, and attribute-specific match weights according to agreement pattern {date of birth, sex, postcode}. Record pairs with no agreement on any identifiers, or where only sex agreed (agreement patterns {000} and {010}), were assumed to be non-matches and excluded

		Agreement pattern {date of birth, sex, postcode}
		001	100	011	101	110	111
N Matches		1	21	18	12	15,924	14,009
N Non-matches		259	414,307	248	4	415,888	10
Match probabilitya		0.0039	0.0001	0.0726	0.7500	0.0369	0.9993
Traditional match weight		5.3	−1.0	9.6	14.9	8.6	23.7
Match weight assuming dependence		−0.5	−1.2	9.3	17.8	8.6	27.6
Attribute-specific match weight:
Sex	Female	−1.7	−1.7	8.7	17.3	8.7	27.7
	Male	0.4	−0.9	9.7	18.1	8.5	27.5
Age	0–1 years	−0.5	0.1	8.6	18.5	9.2	27.6
	5–6 years	−0.2	−2.0	9.6	18.2	7.9	28.0
	18–19 years	−1.5	−2.6	9.5	16.2	8.3	27.2
Ethnicity	Missing	2.7	0.3	10.8	19.5	8.5	27.6
	White	−1.3	−1.6	8.8	17.4	8.6	27.6
	Mixed	1.8	−0.4	10.9	19.4	8.8	28.6
	Asian	−0.4	−2.3	10.4	16.9	8.6	27.8
	Black	1.6	0.9	9.6	19.1	8.9	27.1
	Other	1.4	−0.2	10.5	19.0	8.8	28.1
Organisational-specific match weight (mean)		5.7	1.3	12.3	20.7	8.1	25.4

^aMatch probability = N matches/Total record pairs